Chapter 7- Gaslaws

Question 1

According to Charles’ law, as the temperature of a given sample of gas at constant pressure is increased, the volume will

Answer 1

increase

Question 2

What must remain constant if Charles’ law is to be applied to a given sample of a gas?

Answer 2

pressure

Question 3

What temperature scale must be used when applying Charles’ law?

Answer 3

Kelvin

Question 4

To convert a Celsius temperature to Kelvin, you would

Answer 4

add 273.15

Question 5

According to Charles’ law, volume and temperature vary

Answer 5

directly

Question 6

The temperature at which the volume of a gas theoretically becomes zero is

Answer 6

absolute zero

Question 7

35°C is equal to

Answer 7

308 K

Question 8

420 mL of a gas at 25.0°C is compressed to 210 mL. What is the temperature of the gas after compression?

Answer 8

149 K

Question 9

A sample of helium gas is heated from 20.0°C to 40.0°C. This heating process causes the gas to expand to a volume of 585 mL. What was the original volume of the helium gas?

Answer 9

548 mL

Question 10

In all gas equations, temperature is measured in

Answer 10

Kelvin

Question 11

The conditions of 1 atm pressure and 0°C are known as

Answer 11

standard temperature and pressure

Question 12

What is the volume of 1.00 mole of any gas at STP?

Answer 12

22.4 L

Question 13

The Ideal Gas law allows you to calculate which quantity that is not possible in Boyle’s or Charles’ law?

Answer 13

number of moles

Question 14

In the ideal gas law, R is

Answer 14

the ideal gas constant

Question 15

The number of moles can be calculated by

Answer 15

mass of sample divided by molar mass

Question 16

For questions 7–8, the ideal gas constant is 0.08206 L‐atm/k‐mol.

A 5.00 L sample of N 2 is held at a pressure of 2.00 atm at 315 K. How many moles of N 2 are present in this sample?

Answer 16

0.387 mole N 2

Question 17

If you have 1.00 mole of F 2 at 1.00 atm of pressure and 0°C, what is the volume of F 2?

Answer 17

22.4 L

Question 18

Which state of matter was the easiest for early scientists to describe?

Answer 18

gas

Question 19

The Italian chemist, Amedeo Avogadro, concluded that

Answer 19

equal volumes of different gases contain the same number of molecules

Question 20

The amount of force exerted on one unit area is

Answer 20

pressure

Question 21

Boyle’s law states that for a given amount of gas at constant temperature, the volume and pressure of a gas vary

Answer 21

inversely

Question 22

The standard international unit of pressure is

Answer 22

pascal

Question 23

2.5 atmospheres of pressure is

Answer 23

1900 mm Hg

Question 24

According to Boyle’s law, as the pressure exerted on a gas is increased, the volume will

Answer 24

decrease

Question 25

At constant temperature, if a gas occupies 312 mL at a pressure of 1.60 atm, what pressure is necessary for this gas to occupy a volume of 500 mL?

Answer 25

1.00 atm

Question 26

For a given sample of a gas, what must remain constant if Boyle’s law is to be applied?

Answer 26

temperature